An Asian plant (Brassica rapa subsp. rosularis) of the mustard family, having dark green, spoon-shaped, edible leaves that grow in a dense rosette. Also called spoon mustard .
Origin of tatsoiUltimately from a Chinese source such as Cantonese taap3 coi3 ( akin to Mandarin tācài )Cantonese taap3 to fall down, in reference to its low, spreading rosette of leaves ( from Middle Chinese thap ) coi3 vegetable ; see bok choy .
Brassica rapa subsp. rosularis